Another option since you have spent $$$ on shafts and 30 center section parts is to get the inner knuckles off a CJ D30 and the outer knuckles from a waggy or K5, ect D44 (flattops) chev style spindles and brakes with a 5 or 6 lug hub depending on your preferance.... The OEM length 30 shafts will not work unless you add 1.25" to each axle tube or take the aproppriate amount out of the shafts...
This gives you all the benefits to the 44 conversions listed above but keeps the parts you already spend $$ on... I have done this conversion using all fullsize bits. Billavista (mostly hangs on pirate4x4 - since he is no longer using an XJ) did it using the CJ and chev stuff with non-OEM length axle (and was my model)
You can then run the warn premium internal hubs, have a high steer system, better ball joints, no more unit bearings, stronger stubs (available in alloy), ect, ect...
Just another option - definitally not a common conversion but it works for me - HTH
Matt
Edit: I forgot costwise if your a scrounger you can do this cheaply - I am $350 in with OEM shafts and ~$1300 in with everything (warn alloy shafts, new bearings, 4.88 gears, new carrier w/ welded spiders, hydro assist, 3-link, lockouts and wheels)